Ordered the o-rings at a local Peugeot dealer.
Citroen & Peugeot numbers
193320, 193319, 193318.
(the larger black ring to seal reg unit to pump face, inj pump gasket, 1033 19 @ 17.6 x 19.6
the tiny white ring, pump reg support ring, 1933 20 @ 3.6 x 6.6
green end ring, inj pump gasket, 1933 18 @...